height, weight = eval(input("请输入身高(米)和体重(公斤)[逗号隔开]: "))
bmi = weight / pow(height, 2)
print("BMI 数值为：{:.1f}".format(bmi))
who,nat = "",''
if bmi< 18.5:
    who,nat = "偏瘦","偏瘦"
elif 18.5 <= bmi < 25:
    who,nat = "正常","正常"
elif 25 <= bmi < 28:
    who,nat = "偏胖","偏胖"
elif 28 <=bmi <30:
    who,nat = "偏胖","肥胖"
else:
    who,nat = "肥胖","肥胖"
print("BMI 指标为:国际'{}',国内'{}'".format(who,nat))
